(a)–(c) refer to three different structures where the playing frequency and the damping rate are invariant (f = 200 Hz and ξ = 0.29%) in blue line the G3 string of a violin, in black line a G3 resonator of cristal, in yellow line hybrid cristal where the modal mass has been divided by 5; (d)–(f) refer to 1-mode cristal’s model with equal maximum mobility, with variation of damping and modal mass by α ratio; (a) and (d) are transfer-mobility functions; (b) and (e) are phase diagram of the periodic regime of the different system responses to the following frictional excitation: sudden application of bowing velocity = 0.1 m.s⁻¹, with a normal force F_N = 0.3 N; (c) and (d) are the zoomed Figures (b) and (e).